Akys4

I haven’t checked nothing myself the mechanic checked it and said it was the Conrad bearings on gearbox which I don’t really have a clue much about them but after doing a little research my gearbox don’t make a grinding noise or any sort of noise whilst I’m have the issue it has happened 3 or 4 times ever since I have left the car parked at the garage

I’m having same issue with my s4 b7 at times 1st and 2nd work spot on and then sometimes won’t go in to gear after a few attempts it go into gear